Two-dimensional approach to psychophysical orientation tuning.
Orientation bandwidths of psychophysical channels in the human visual system were inferred from contrast thresholds for a special class of polar-separable, two-dimensional patterns. Detection thresholds for these patterns conformed to a model with linear filtering by orientation-selective channels followed by probability summation across these channels. The number of channels (6-8 pairs) and their half-bandwidths at half-sensitivity (approximately 17 degrees) did not differ at 4 and 10 cycles/degree. The results extend the many one-dimensional, linear system models of vision to two dimensions.
Dannemiller
J L
JL
Department of Psychology, University of Wisconsin--Madison 53706.
Ver Hoeve
J N
JN
D006801:Humans; D009949:Orientation; D011601:Psychophysics / Q000379:methods*; D012684:Sensory Thresholds; D014785:Vision, Ocular / Q000502:physiology*